Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb960c886238d5ed…

MALICIOUS

PDF

85.5 KB Created: 2021-09-08 06:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4a8b1e0a9530ed8fb64e1990588d88d4 SHA-1: c619f65f8101343c3bfce27a47e93d679cb183c1 SHA-256: cb960c886238d5ed2219509fa628e95f25b47ed056d436cde884eb50462aa631
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including one pointing to a compromised WordPress upload, suggesting it functions as a link farm or phishing lure. The presence of multiple PDF-specific heuristics related to URI and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/uplcv?utm_term=fitzpatrick+dermatologia+pdf+gratis PDF link annotation
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/javiloxarat.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/modikogamafutotokilub.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/podej.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff933690c4.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/lutunigoni.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/xalisalokufuviwuziviwomu.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/dotelodetutufoposo.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/21761078266.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/6322772732.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/kakuwawa.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/3e9b11542e04f76649f82429bd971153/38221665738.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/87389307968.pdfIn PDF document text
    • https://mollis.rs//files/fonimiwogogixege.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/91604140999.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608567b392a5b---72751464909.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e45d6355273057635603f482d89ffb87/pugamovokixakojuf.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/91990217552.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/kidonijizufuseguki.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/wuwipakiduzupukofapedowo.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210823231624.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f29a9b0db---pexasivojibum.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/e037b23da0cdc8829ca1b7fa6c1b9b48/19286482082.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/70358523802.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 18156 bytes
SHA-256: 56cbef61956f4f82fabdd6e1ce4faaa32500b65825943c42ee5a859cb7f5a317
font_01_sfnt_off0001168f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA6 10988 bytes
SHA-256: deed60ba79bbc77f326844055e20e05e6e9652150cbff4901a2e7ce899a4354e

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